The pair film a scene during a real Red Sox game. Plus: Demi Moore, Jessica Simpson and more

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ROCKING OUT

Avril Lavigne – who recently has been showing off a large diamond ring on her left hand – hits the dancefloor with Hoobastank frontman Doug Robb after winning at the World Music Awards in Las Vegas on Wednesday. Lavigne, who is dating Sum 41 vocalist Deryck Whibley, was named best rock/pop artist at the ceremony.